I didn't here about Overlord until Friday, which was when I found out about the demo on Xbox 360. The game looks awesome! It's like Nintendo's Pikmin but you control an evil overlord and his monster minions. The first level in the demo has you slaughtering hobbits. And the graphics are really good.
It's going to be out on Xbox360 and PC June 26, and I recommend trying it out. Not sure how the PC version will control since the Xbox 360 version requiers extensive use of the right stick, though.
And apparently it has multi, including co-op.